Denkou Choujin Gridman: boys invent great hero is the ninth short featured in the Japan Animator Expo. It is based off of the live action series Denkou Choujin Gridman.
The entire short took place 22 years after Gridman's final battle with Kahn Digifier. Toudou Takeshi, a former brainwashed servant of Kahn, reflects on the past incidents as monster attacks took place in real life. Using the Acceptor, he transforms into Gridman Sigma before facing the monster.
